1. Blown Fuses or Tripped Breakers If a string fuse has blown or a DC circuit breaker has tripped, the current from that string will drop to zero. This is a protective response to overcurrent or short circuits. Always check each fuse and breaker individually and replace or reset only after identifying the root cause of the fault . 2. Loose or Faulty Electrical Connections Loose terminals, poor contact, or broken cables inside the combiner box can prevent current flow. Symptoms include fluctuating or zero current readings. Inspect all connections and tighten or replace any damaged wiring . 3. Module or String Failures A malfunctioning solar panel or string can result in zero current output. This may be due to shading, internal module failure, or mismatch between strings. Verify each string's voltage and current to isolate the faulty module . 4. Surge Protection Device (SPD) or Overvoltage Issues A failed SPD or damage from lightning or grid voltage fluctuations can interrupt current flow. Check SPD indicators and replace any faulty devices to restore normal operation . 5. Environmental or Installation Factors Water ingress, dust accumulation, or corrosion can cause short circuits or open circuits. Ensure the combiner box is properly sealed and maintained, especially in harsh environments .
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